EWT Water Technology – Water Treatment

EWT Water Technology

Cartridge Filter

HomeProductsCartridge FilterSummaryDesign ExampleApplicationsTechnical DataDownloads


Within the scope of water treatment, filtration ist a mainly physical process for removal of suspended solids from liquids. The liquid to be filtrated flows through a filter medium, which results in the suspended solids being retained by this filter medium. A cartridge filter (in case of certain designs also: candle filter) is a vessel for filtration, with an arrangement of filter cartridges serving as filter medium. Filter cartridges are available in different designs and material, for example melt-blown cartridges made of PP or wound cartridges made of cotton.

With increasing service life, the differential pressure between the filter inlet and out increases for a given volume flow, as more solids are being retained within the filter medium. Eventually, the filter medium needs to be either backwashed or replaced.

Filter cartridges are usually replaced, certain types are within limitations also suitable for backwashing.

top of page

Design Example:

cartridge filter

Cartridge filter plant, two lines, filter housing with several replaceable filter cartriges for each line, with differential pressure measurement and fully automated line change-over.

top of page


top of page

Technical Data:

filtrate volume flow available from approx. 0.5 up to 300 m³/h for each line
amount of lines usually 1x100%, 2x100% or 2x50%
filtration grade 1 ... 100 μm, depending upon filter cartridge design
filtrate quality turbidity ≤ 0.1 ... 1 NTU
total suspended solids (TSS) ≤ 0.5 ... 1 mg/L
differential pressure at nominal flow rate usually ≤ 0.2 ... 1.5 bar
operating temperature usually 5 ... 40 °C
for condensate filtration ≤ 110 °C
recommended raw water quality total suspended solids (TSS) < 10 mg/L
service life of the filter cartridges working filters usually 1 ... 4 weeks
protective filters usually 3 ... 12 months
material options pressure vessel • polypropylene (PP)
• carbon steel (e.g. S235JR, P265GH)
• stainless steel (e.g. 1.4301, 1.4404)
filter cartridge • polypropylene (PP)
• cotton
• polyamide fibres (Nylon)
• stainless steel (e.g. 1.4301)
• ...
pipelines • polyvinyl chloride (PVC)
• polypropylene (PP)
• carbon steel (e.g. P235TR2, P235GH)
• stainless steel (e.g. 1.4541)
valves • polyvinyl chloride (PVC)
• polypropylene (PP)
• brass (e.g. CW617N)
• grey cast iron (e.g. EN-JL 1040)
• stainless steel (e.g. 1.4408)
gaskets • etyhlene propylene diene monomer rubber (EPDM)
• fluoroelastomer (FKM)
• polytetrafluorethylene (PTFE)
• NBR composite
control options differential pressure monitoring • local display
• remote measurement
filtrate quality monitoring • manual sampling and analysis
• continuous turbidity measurement
line change-over • manually
• fully automated
backwash • manually (if backwash is possible)
• fully automated (if backwash is possible)

top of page


top of page

2018-05-05 • water treatment made in GermanyCompany InformationPrivacy